217AC 217AC IT DECAY (740 NS) 1985DE14 18NDS 201802
217AC H TYP=FUL$AUT=B. SINGH, A. CHAKRABORTY, S. BHATTACHARYA$
217AC2 H CIT=NDS 147, 382 (2018)$CUT=1-DEC-2017$
217AC c 1985De14 (also 1981MaYW): investigation of level structure of
217AC2c {+217}Ac through |a|g, |g|g, |a(ce)- and (ce)(ce)(ce)-coin, g factors
217AC3c by |a(|q,H,t)-TDPAD method, and half-lives of g.s. and isomer using the
217AC3c following three reactions:
217AC4c 1. {+205}Tl({+16}O,4n),E({+16}O)=96 MeV pulsed beam. Level scheme
217AC5c proposed below 1683-keV excitation. Seven Ge(Li) and Ge detectors and
217AC6c eight NaI(Tl) detectors were used.
217AC7c 2. {+206}Pb({+15}N,4n),E({+15}N)=80,84,87 MeV; measured g-factor by
217AC8c Directional Perturbed Angular Distribution (DPAD) method with
217AC9c |a particle measurement using three pairs of Si detectors. See also
217ACCc 3. {+209}Bi({+12}C,4n),E({+12}C)=75 MeV, pulsed beam; measured |a
217ACDc spectra, |a-ce and ce-ce coincidences using Si detectors.
217AC c 1983GoZX, 1983GoZP, 1982GoZU, 1982SaZO: E({+12}C)=77, 80 MeV pulsed
217AC2c beam; measured E|g, E|a, |g|g and |a|g at the Tandem accelerator
217AC3c laboratory of Tsukuba University. Details of this study are not
217AC4c available.
217AC c Decay scheme is basically as proposed by 1985De14 from
217AC2c their |g|g and |g(ce) coincidences. In the level scheme shown by
217AC3c 1982GoZU, ordering of the 478.9 and 349.0 gammas was reversed, and
217AC4c a level at 1019 keV was introduced from these cascading gammas.
217AC5c Their (486.4|g)(|g) coincidence spectrum shown, however, indicates
217AC6c the presence of the 349.0|g and absence of the 478.9|g. Gamma rays
217AC7c observed at 501.6, 371.7, 380, and 327.6 keV were placed by 1982GoZU
217AC8c in cascade to deexcite proposed levels at 3263, 2762, 2390 and 2010,
217AC9c respectively. These levels and |g placements are assumed
217ACbc here as preliminary results.
217AC cG $A{-2} from |g(|q) data, and conversion electron intensities are from
217AC2cG measurements by 1985De14
217AC cG E$Measured E|g values in 1985De14 were reported to nearest keV and with
217AC2cG no uncertainties. Corresponding values in 1983GoZX and 1982GoZU listed
217AC3cG to nearest tenth of a keV agree with those in 1985De14. More precise
217AC4cG values from 1983GoZX are given here when available, even though these
217AC5cG values are also listed without uncertainties, and remain unpublished
217AC6cG as a regular journal article.
217AC cG RI$Absolute photon intensities from 1985De14.
217AC cG M$From ce measurements and angular distribution data of 1985De14.
217AC2cG The ce intensities given in 1985De14 are absolute intensities per
217AC3cG 100 decays of the 740-ns isomer.
217AC cG M(B)$From ce data as well as |g(|q) data, M1 admixture is possible,
217AC2cG however, based on the level scheme, mult=E2 is required
217AC cG E(D)$This |g from 1985De14 only, not reported by 1983GoZX
217AC2cG or 1982GoZU
217AC cL E$From least-squares fit to E|g data, assuming 0.3 keV uncertainty
217AC2cL for each |g ray, except 1 keV when E|g stated to nearest keV
217AC cL J$From Adopted Levels
217AC P 2012.2 7 (29/2)+ 740 NS 40
217AC N 1.048 1.048 0.9549 18
217AC CN NR,NT$1/BR. Absolute |g and electron intensities (per 100 decays of
217AC2cN the isomer) given by 1985De14
217AC CN BR$%IT=95.49 18
217AC PN 3
217AC L 0.0 9/2- 69 NS 4
217AC2 L G=+0.85 1 (1985De14,1981MaYW)
217AC2 L %A=100
217AC cL T$from Adopted Levels
217AC cL $This level decays 100% by |a. E|a=9650 {I10} (1973No09),
217AC2cL %I|a=94.8 {I20} (1985De14) observed in the 740-ns isomer decay;
217AC3cL {+217}Ac g.s. to {+213}Fr g.s. |a transition
217AC L 660.2 3 13/2-
217AC G 660.3 83 7 E2 0.0218
217AC cG $Ice(K)=0.92 {I25}, Ice(L)=0.32 {I11}, Ice(M)=0.07 {I7}.
217AC2 G A2=+0.17 2 (1985De14)
217ACS G NC=0.000318 5$OC=7.20E-5 11$PC=1.252E-5 18$QC=6.89E-7 10
217AC cG M$from K/L(exp)=2.8 {I12}
217ACS G KC=0.01544 22$LC=0.00474 7$MC=0.001198 17
217AC L 670.2 3 11/2-
217AC G 670.1 11 3 M1+E2 0.055 34
217AC cG $Ice(K)=0.31 {I31}, Ice(L)=0.08 {I4}, Ice(M)=0.04 {I4}.
217AC cG M,MR$from |a(L)exp=0.0073 {I36}; |d overlaps all values
217AC cG CC$value within the uncertainty overlaps pure M1 and pure E2
217ACS G KC=0.043 29$LC=0.0088 43$MC=0.00213 98
217ACS G NC=5.6E-4 26$OC=1.30E-4 62$PC=2.4E-5 12$QC=1.9E-6 13
217AC L 1146.6 4 17/2-
217AC2 L %A LE 0.27 4 (1985DE14)
217AC cL $Observed 10780 {I15} |a transition with I|a=0.27% {I4} was assigned
217AC2cL by 1985De14 from 1147 and/or 1149 levels to the {+213}Fr g.s.
217AC G 486.4 77 8 E2 0.0434 B
217AC2 G A2=+0.18 3 (1985De14)
217ACS G KC=0.0275 4$LC=0.01181 17$MC=0.00305 5
217ACS G NC=0.000811 12$OC=0.000182 3$PC=3.08E-5 5$QC=1.282E-6 18
217AC cG $Ice(K)=1.6 {I7}, Ice(L)=0.92 {I47}
217AC cG M$from |a(K)(exp)=0.021 {I10}, |a(L)exp=0.012 {I6}, and |g(|q)
217AC L 1149.1 3 15/2-
217AC2 L %A LE 0.27 4 (1985DE14)
217AC cL $Observed 10780 {I15} |a transition with I|a=0.27% {I4} was assigned
217AC2cL by 1985De14 from 1147 and/or 1149 levels to the {+213}Fr g.s.
217AC G 478.9 8 2 E2 0.0450 B
217AC cG $Ice(K)=0.33 {I24}, Ice(L)=0.23 {I16}
217ACS G KC=0.0283 4$LC=0.01241 18$MC=0.00321 5
217ACS G NC=0.000854 12$OC=0.000191 3$PC=3.24E-5 5$QC=1.324E-6 19
217AC cG E$a 479-keV |g reported in 1982SaZO, placed from a 1498 level
217AC cG M$from |a(K)(exp)=0.041 {I19}, |a(L)exp=0.029 {I22}
217AC G 489 6 2 M1(+E2) 1 LT 0.16 4 D
217ACS G KC=0.130 35$LC=0.026 5$MC=0.0062 11
217ACS G NC=0.0016 3$OC=0.00038 7$PC=7.0E-5 14$QC=5.8E-6 16
217AC cG $|g not seen in 1982GoZU
217AC cG $Ice(K)=1.1 {I4}, Ice(L)=0.18 {I9}
217AC cG M,MR$from |a(K)(exp)=0.18 {I9} and |a(L)exp=0.030 {I18}; |d deduced
217AC2cG by evaluators using BrIccMixing code. 1985De14 deduce up to 90% E2
217AC3cG admixture, or |d<3
217AC L 1498.1 4 19/2-
217AC2 L %A LE 0.46 13 (1985DE14)
217AC cL $Observed 11137 {I15} |a doublet with I|a=0.46% {I13} was assigned
217AC2cL by 1985De14 from 1498 and/or 1528 levels to the {+213}Fr g.s.
217AC cL T$see comment for half-life on 1528 level
217AC G 349.0 16 2 E2 0.1028 B
217ACS G NC=0.00259 4$OC=0.000576 9$PC=9.50E-5 14$QC=2.62E-6 4
217ACS G KC=0.0529 8$LC=0.0369 6$MC=0.00975 14
217AC cG $Ice(K)=0.58 {I55}, Ice(L)=0.46 {I24}.
217AC cG M$from |a(K)(exp)=0.036 {I35}, |a(L)exp=0.029 {I16}
217AC G 351.5 21 2 M1+E2 +0.65 +20-10 0.38 5
217AC2 G A2=+0.30 4 (1985De14)
217ACS G KC=0.30 5$LC=0.063 5$MC=0.0154 11
217ACS G NC=0.0041 3$OC=0.00094 7$PC=0.000171 14$QC=1.34E-5 19
217AC cG $Ice(K)=7.4 {I12}, Ice(L)=2.3 {I8}, Ice(M)=0.53 {I18}.
217AC cG M,MR$from |a(K)(exp)=0.35 {I7}, |a(L)exp=0.109 {I40},
217AC2cG |a(M)exp=0.025 {I9}, and |d=+0.65 {I+20-10} for |DJ=1
217AC3cG from |g(|q). From ce data, evaluators deduce |d=0.3 {I+5-3} using
217AC4cG BrIccMixing code.
217AC L 1528.4 5 (21/2)- 10 NS LT
217AC2 L %A LE 0.46 13 (1985DE14)
217AC cL $Observed 11137 {I15} |a doublet with I|a=0.46% {I13} was assigned
217AC2cL by 1985De14 from 1498 and/or 1528 levels to the {+213}Fr g.s.
217AC cL T$from |g|g(t) (1985De14). Other: 8 ns {I2} was measured by 1973No02
217AC2cL for the 11130|a from either the 1149 or 1528 level. No level with
217AC3cL 8 ns half-life was found by 1985De14, but could not be definitely
217AC4cL ruled out either by the authors
217AC G 30.3 6 0.41 4 [M1] 114 7 47 4 S
217ACS G L/T=0.75 4$M/T=0.180 15
217ACS G N/T=0.048 5$O/T=0.0111 10$P/T=0.00206 19$Q/T=0.000183 17
217ACS G LC=86 6$MC=20.7 13
217ACS G NC=5.5 4$OC=1.28 8$PC=0.236 15$QC=0.0210 14
217AC cG E$from the level scheme. The |g-ray is not seen, its existence was
217AC2cG deduced by 1985De14 from the observed (154|g)(351|g) coincidence.
217AC3cG Because of the prompt coincidences, T{-1/2}(1528.5 level)<10 ns;
217AC4cG which implies M1 multipolarity for the 30.3|g (1985De14).
217AC cG TI$weighted average of 48 {I4} from intensity balance at the 1498
217AC2cG level, and 35 {I15} from intensity balance at the 1528 level, deduced
217AC3cG by evaluators
217AC cG RI$from I(|g+ce) and |a(theory) for M1
217AC G 381.8 46 5 E2 0.0803 B
217AC2 G A2=+0.18 3
217ACS G KC=0.0442 7$LC=0.0267 4$MC=0.00702 10
217ACS G NC=0.00187 3$OC=0.000415 6$PC=6.90E-5 10$QC=2.15E-6 3
217AC cG $Ice(K)=1.7 {I6}, Ice(L)=1.1 {I5}, Ice(M)=0.31 {I10}.
217AC cG M,MR$from |a(K)(exp)=0.037 {I14}, |a(L)exp=0.024 {I11},
217AC2cG |a(M)exp=0.0067 {I23}, and |g(|q)
217AC L 1682.2 6 (23/2)-
217AC G 153.8 16 2 M1+E2 +0.39 8 4.57 18
217AC2 G A2=+0.19 5
217ACS G KC=3.52 20$LC=0.795 20$MC=0.195 7
217ACS G NC=0.0518 17$OC=0.0119 4$PC=0.00214 5$QC=0.000161 9
217AC cG $Ice(K)=53 {I13}, Ice(L)=12 {I3}, Ice(M)=3 {I1}.
217AC cG M,MR$from |a(K)(exp)=3.3 {I9}, |a(L)exp=0.75 {I21},
217AC2cG |a(M)exp=0.19 {I7}, K/L=4.4 {I15}, and |d=+0.39 {I8} for |DJ=1
217AC3cG from |g(|q). From ce data, evaluators deduce |d=0.4 {I+5-4} using
217AC4cG BrIccMixing code
217AC L 1792.2 6 (25/2)-
217AC G 110 7 1 M1(+E2) 0.4 LT 12.5 6 D
217ACS G KC=9.6 8$LC=2.17 22$MC=0.53 7
217ACS G NC=0.141 17$OC=0.033 4$PC=0.0059 5$QC=0.00045 4
217AC cG $Ice(L)=12 {I7}, Ice(M)=3 {I1}.
217AC cG M,MR$from |a(L)exp=1.7 {I10}, |a(M)exp=0.43 {I15}, |d deduced by
217AC2cG evaluators using BrIccMixing code. 1985De14 give M1
217AC L 1916.2 6 (27/2)-
217AC G 234 5 1 E2 0.357 8 D
217ACF G FLAG=B
217ACS G KC=0.1185 20$LC=0.175 4$MC=0.0472 11
217ACS G NC=0.0126 3$OC=0.00276 7$PC=0.000445 10$QC=6.66E-6 12
217AC cG $Ice(L)=2.7 {I22}, Ice(M)=1.3 {I12}.
217AC cG M$from |a(L)exp=0.54 {I45}, |a(M)exp=0.26 {I24}
217AC L 2012.2 7 (29/2)+ 740 NS 40 M1
217AC2 L G=+0.347 5 (1985De14)
217AC2 L %A=4.51 18 (1985DE14) $ %IT=95.49 18
217AC cL $This level partially decays by three |a transitions (1985De14):
217AC2cL E|a=11625 {I17}, I|a=0.12 {I2}, transition to {+213}Fr g.s.;
217AC3cL E|a=11137 {I15}, I|a=0.32 {I9}, transition to 498, 7/2- level in
217AC4cL {+213}Fr; E|a=10541 {I1} (from E|a=9650 and decay scheme),
217AC5cL I|a=4.07 {I16}, transition to 1105, 13/2+ level in {+213}Fr. The |a|g
217AC6cL data in 1985De14 revealed (10541|a)(1105|g)- and
217AC7cL (11137|a)(498|g)-coincidences
217AC cL $g factor from Table 2 in 1985De14, where corrections for diamagnetic
217AC2cL and Knight shifts were applied. Note that in authors' level-scheme
217AC3cL Figure 12, g=0.345 {I10}. Their previous g=+0.34 {I1} (1981MaYW)
217AC cL T$from |g(t) (1985De14). Other measurement: 400 ns {I100} (1973No02)
217AC cL $|a(|q) measurements for 10.54-MeV |a from the 2012 level:
217AC2cL A{-2}=+0.56 {I3}, A{-4}=+0.24 {I5} (1985De14). See also 1973No02 for
217AC3cL |a(|q) measurement
217AC G 96 5 1 E1+M2 0.17 +5-6 2.0 12
217ACS G LC=1.44 87$MC=0.39 24
217ACS G NC=0.105 64$OC=0.024 15$PC=0.0043 27$QC=3.2E-4 20
217AC cG $Ice(L)=6 {I4}, Ice(M)=4 {I3} (1985De14).
217AC cG M,MR$from |a(L)exp=1.2 {I8}, |a(M)exp=0.8 {I6}; |d=0.17 {I+5-6} deduced
217AC2cG by evaluators using BrIccMixing code. 1985De14 give |d(M2/E1)=0.15 {I5}
217AC G 220 10 2 M2(+E3) 0.6 LT 7.62 17
217ACS G KC=5.31 11$LC=1.72 4$MC=0.444 10
217ACS G NC=0.120 3$OC=0.0277 7$PC=0.00501 12$QC=0.000403 9
217AC cG $Ice(K)=55 {I8}, Ice(L)=19 {I3}, Ice(M)=5 {I3}.
217AC cG M,MR$from |a(K)(exp)=5.5 {I14}, |a(L)exp=1.9 {I5},
217AC2cG |a(M)exp=0.50 {I34}; BriccMixing code gives |d(E3/M2)<0.6, but
217AC3cG this value gives B(E3)(W.u.) which is inconsistent with RUL,
217AC4cG thus pure M2 is adopted as suggested in 1985De14, although, small
217AC5cG E3 admixture is not excluded.